Excellent spark plugs so far (approx. 500 miles). I used to use an NGK TR6 in my GT500 that ran about 15psi of boost with .035 clearance. At the moment they seem to idle / run even smoother (but new candles don't always run smoother, I need to update the review after about 10-12k miles. Note I still change my candles about once a year, so I always ride with inexpensive standard forks, not expensive Iridium forks).
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